com.c revision 1.112
1 /* $NetBSD: com.c,v 1.112 1997/10/03 06:11:35 mikel Exp $ */ 2 3 /*- 4 * Copyright (c) 1993, 1994, 1995, 1996, 1997 5 * Charles M. Hannum. All rights reserved. 6 * 7 * Interrupt processing and hardware flow control partly based on code from 8 * Onno van der Linden and Gordon Ross. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by Charles M. Hannum. 21 * 4. The name of the author may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * Copyright (c) 1991 The Regents of the University of California. 38 * All rights reserved. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. All advertising materials mentioning features or use of this software 49 * must display the following acknowledgement: 50 * This product includes software developed by the University of 51 * California, Berkeley and its contributors. 52 * 4. Neither the name of the University nor the names of its contributors 53 * may be used to endorse or promote products derived from this software 54 * without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 59 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 66 * SUCH DAMAGE. 67 * 68 * @(#)com.c 7.5 (Berkeley) 5/16/91 69 */ 70 71 /* 72 * COM driver, uses National Semiconductor NS16450/NS16550AF UART 73 */ 74 #include <sys/param.h> 75 #include <sys/systm.h> 76 #include <sys/ioctl.h> 77 #include <sys/select.h> 78 #include <sys/tty.h> 79 #include <sys/proc.h> 80 #include <sys/user.h> 81 #include <sys/conf.h> 82 #include <sys/file.h> 83 #include <sys/uio.h> 84 #include <sys/kernel.h> 85 #include <sys/syslog.h> 86 #include <sys/types.h> 87 #include <sys/device.h> 88 89 #include <machine/intr.h> 90 #include <machine/bus.h> 91 92 #include <dev/isa/comreg.h> 93 #include <dev/isa/comvar.h> 94 #include <dev/ic/ns16550reg.h> 95 #ifdef COM_HAYESP 96 #include <dev/ic/hayespreg.h> 97 #endif 98 #define com_lcr com_cfcr 99 #include <dev/cons.h> 100 101 #include "com.h" 102 103 #ifdef COM_HAYESP 104 int comprobeHAYESP __P((bus_space_handle_t hayespioh, struct com_softc *sc)); 105 #endif 106 107 #if defined(DDB) || defined(KGDB) 108 static void com_enable_debugport __P((struct com_softc *)); 109 #endif 110 void com_attach_subr __P((struct com_softc *sc)); 111 void comdiag __P((void *)); 112 int comspeed __P((long, long)); 113 static u_char cflag2lcr __P((tcflag_t)); 114 int comparam __P((struct tty *, struct termios *)); 115 void comstart __P((struct tty *)); 116 void comstop __P((struct tty *, int)); 117 #ifdef __GENERIC_SOFT_INTERRUPTS 118 void comsoft __P((void *)); 119 #else 120 #ifndef alpha 121 void comsoft __P((void)); 122 #else 123 void comsoft __P((void *)); 124 #endif 125 #endif 126 int comhwiflow __P((struct tty *, int)); 127 128 void com_loadchannelregs __P((struct com_softc *)); 129 void com_hwiflow __P((struct com_softc *)); 130 void com_break __P((struct com_softc *, int)); 131 void com_modem __P((struct com_softc *, int)); 132 void com_iflush __P((struct com_softc *)); 133 134 int com_common_getc __P((bus_space_tag_t, bus_space_handle_t)); 135 void com_common_putc __P((bus_space_tag_t, bus_space_handle_t, int)); 136 137 /* XXX: These belong elsewhere */ 138 cdev_decl(com); 139 bdev_decl(com); 140 141 int comcngetc __P((dev_t)); 142 void comcnputc __P((dev_t, int)); 143 void comcnpollc __P((dev_t, int)); 144 145 #define integrate static inline 146 integrate void comrxint __P((struct com_softc *, struct tty *)); 147 integrate void comtxint __P((struct com_softc *, struct tty *)); 148 integrate void commsrint __P((struct com_softc *, struct tty *)); 149 integrate void com_schedrx __P((struct com_softc *)); 150 151 struct cfdriver com_cd = { 152 NULL, "com", DV_TTY 153 }; 154 155 static int comconsaddr; 156 static bus_space_tag_t comconstag; 157 static bus_space_handle_t comconsioh; 158 static int comconsattached; 159 static int comconsrate; 160 static tcflag_t comconscflag; 161 162 static u_char tiocm_xxx2mcr __P((int)); 163 164 #ifndef __GENERIC_SOFT_INTERRUPTS 165 #ifdef alpha 166 volatile int com_softintr_scheduled; 167 #endif 168 #endif 169 170 #ifdef KGDB 171 #include <sys/kgdb.h> 172 173 static int com_kgdb_addr; 174 static bus_space_tag_t com_kgdb_iot; 175 static bus_space_handle_t com_kgdb_ioh; 176 static int com_kgdb_attached; 177 178 int com_kgdb_getc __P((void *)); 179 void com_kgdb_putc __P((void *, int)); 180 #endif /* KGDB */ 181 182 #define COMUNIT(x) (minor(x)) 183 184 int 185 comspeed(speed, frequency) 186 long speed, frequency; 187 { 188 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 189 190 int x, err; 191 192 #if 0 193 if (speed == 0) 194 return (0); 195 #endif 196 if (speed <= 0) 197 return (-1); 198 x = divrnd(frequency / 16, speed); 199 if (x <= 0) 200 return (-1); 201 err = divrnd(frequency * 1000 / 16, speed * x) - 1000; 202 if (err < 0) 203 err = -err; 204 if (err > COM_TOLERANCE) 205 return (-1); 206 return (x); 207 208 #undef divrnd(n, q) 209 } 210 211 #ifdef COM_DEBUG 212 int com_debug = 0; 213 214 void comstatus __P((struct com_softc *, char *)); 215 void 216 comstatus(sc, str) 217 struct com_softc *sc; 218 char *str; 219 { 220 struct tty *tp = sc->sc_tty; 221 222 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 223 sc->sc_dev.dv_xname, str, 224 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 225 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 226 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 227 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 228 sc->sc_tx_stopped ? "+" : "-"); 229 230 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 231 sc->sc_dev.dv_xname, str, 232 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 233 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 234 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 235 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 236 sc->sc_rx_flags); 237 } 238 #endif 239 240 int 241 comprobe1(iot, ioh, iobase) 242 bus_space_tag_t iot; 243 bus_space_handle_t ioh; 244 int iobase; 245 { 246 247 /* force access to id reg */ 248 bus_space_write_1(iot, ioh, com_lcr, 0); 249 bus_space_write_1(iot, ioh, com_iir, 0); 250 if (bus_space_read_1(iot, ioh, com_iir) & 0x38) 251 return (0); 252 253 return (1); 254 } 255 256 #ifdef COM_HAYESP 257 int 258 comprobeHAYESP(hayespioh, sc) 259 bus_space_handle_t hayespioh; 260 struct com_softc *sc; 261 { 262 char val, dips; 263 int combaselist[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 }; 264 bus_space_tag_t iot = sc->sc_iot; 265 266 /* 267 * Hayes ESP cards have two iobases. One is for compatibility with 268 * 16550 serial chips, and at the same ISA PC base addresses. The 269 * other is for ESP-specific enhanced features, and lies at a 270 * different addressing range entirely (0x140, 0x180, 0x280, or 0x300). 271 */ 272 273 /* Test for ESP signature */ 274 if ((bus_space_read_1(iot, hayespioh, 0) & 0xf3) == 0) 275 return (0); 276 277 /* 278 * ESP is present at ESP enhanced base address; unknown com port 279 */ 280 281 /* Get the dip-switch configurations */ 282 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETDIPS); 283 dips = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); 284 285 /* Determine which com port this ESP card services: bits 0,1 of */ 286 /* dips is the port # (0-3); combaselist[val] is the com_iobase */ 287 if (sc->sc_iobase != combaselist[dips & 0x03]) 288 return (0); 289 290 printf(": ESP"); 291 292 /* Check ESP Self Test bits. */ 293 /* Check for ESP version 2.0: bits 4,5,6 == 010 */ 294 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETTEST); 295 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); /* Clear reg1 */ 296 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS2); 297 if ((val & 0x70) < 0x20) { 298 printf("-old (%o)", val & 0x70); 299 /* we do not support the necessary features */ 300 return (0); 301 } 302 303 /* Check for ability to emulate 16550: bit 8 == 1 */ 304 if ((dips & 0x80) == 0) { 305 printf(" slave"); 306 /* XXX Does slave really mean no 16550 support?? */ 307 return (0); 308 } 309 310 /* 311 * If we made it this far, we are a full-featured ESP v2.0 (or 312 * better), at the correct com port address. 313 */ 314 315 SET(sc->sc_hwflags, COM_HW_HAYESP); 316 printf(", 1024 byte fifo\n"); 317 return (1); 318 } 319 #endif 320 321 #if defined(DDB) || defined(KGDB) 322 static void 323 com_enable_debugport(sc) 324 struct com_softc *sc; 325 { 326 int s; 327 328 /* Turn on line break interrupt, set carrier. */ 329 s = splserial(); 330 sc->sc_ier = IER_ERXRDY; 331 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 332 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 333 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 334 splx(s); 335 } 336 #endif 337 338 void 339 com_attach_subr(sc) 340 struct com_softc *sc; 341 { 342 int iobase = sc->sc_iobase; 343 bus_space_tag_t iot = sc->sc_iot; 344 bus_space_handle_t ioh = sc->sc_ioh; 345 #ifdef COM_HAYESP 346 int hayesp_ports[] = { 0x140, 0x180, 0x280, 0x300, 0 }; 347 int *hayespp; 348 #endif 349 350 if (iot == comconstag && iobase == comconsaddr) { 351 comconsattached = 1; 352 353 /* Make sure the console is always "hardwired". */ 354 delay(1000); /* wait for output to finish */ 355 SET(sc->sc_hwflags, COM_HW_CONSOLE); 356 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 357 } 358 359 #ifdef COM_HAYESP 360 /* Look for a Hayes ESP board. */ 361 for (hayespp = hayesp_ports; *hayespp != 0; hayespp++) { 362 bus_space_handle_t hayespioh; 363 364 #define HAYESP_NPORTS 8 /* XXX XXX XXX ??? ??? ??? */ 365 if (bus_space_map(iot, *hayespp, HAYESP_NPORTS, 0, &hayespioh)) 366 continue; 367 if (comprobeHAYESP(hayespioh, sc)) { 368 sc->sc_hayespioh = hayespioh; 369 sc->sc_fifolen = 1024; 370 371 /* Set 16550 compatibility mode */ 372 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETMODE); 373 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 374 HAYESP_MODE_FIFO|HAYESP_MODE_RTS| 375 HAYESP_MODE_SCALE); 376 377 /* Set RTS/CTS flow control */ 378 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETFLOWTYPE); 379 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, HAYESP_FLOW_RTS); 380 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, HAYESP_FLOW_CTS); 381 382 /* Set flow control levels */ 383 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETRXFLOW); 384 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 385 HAYESP_HIBYTE(HAYESP_RXHIWMARK)); 386 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 387 HAYESP_LOBYTE(HAYESP_RXHIWMARK)); 388 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 389 HAYESP_HIBYTE(HAYESP_RXLOWMARK)); 390 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 391 HAYESP_LOBYTE(HAYESP_RXLOWMARK)); 392 393 break; 394 } 395 bus_space_unmap(iot, hayespioh, HAYESP_NPORTS); 396 } 397 /* No ESP; look for other things. */ 398 if (*hayespp == 0) { 399 #endif 400 401 sc->sc_fifolen = 1; 402 /* look for a NS 16550AF UART with FIFOs */ 403 bus_space_write_1(iot, ioh, com_fifo, 404 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14); 405 delay(100); 406 if (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_FIFO_MASK) 407 == IIR_FIFO_MASK) 408 if (ISSET(bus_space_read_1(iot, ioh, com_fifo), FIFO_TRIGGER_14) 409 == FIFO_TRIGGER_14) { 410 SET(sc->sc_hwflags, COM_HW_FIFO); 411 printf(": ns16550a, working fifo\n"); 412 sc->sc_fifolen = 16; 413 } else 414 printf(": ns16550, broken fifo\n"); 415 else 416 printf(": ns8250 or ns16450, no fifo\n"); 417 bus_space_write_1(iot, ioh, com_fifo, 0); 418 #ifdef COM_HAYESP 419 } 420 #endif 421 422 if (!ISSET(sc->sc_hwflags, COM_HW_NOIEN)) 423 SET(sc->sc_mcr, MCR_IENABLE); 424 425 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 426 int maj; 427 428 /* locate the major number */ 429 for (maj = 0; maj < nchrdev; maj++) 430 if (cdevsw[maj].d_open == comopen) 431 break; 432 433 cn_tab->cn_dev = makedev(maj, sc->sc_dev.dv_unit); 434 #ifdef DDB 435 com_enable_debugport(sc); 436 #endif 437 printf("%s: console\n", sc->sc_dev.dv_xname); 438 } 439 440 #ifdef KGDB 441 /* 442 * Allow kgdb to "take over" this port. If this is 443 * the kgdb device, it has exclusive use. 444 */ 445 if (iot == com_kgdb_iot && iobase == com_kgdb_addr) { 446 com_kgdb_attached = 1; 447 448 SET(sc->sc_hwflags, COM_HW_KGDB); 449 com_enable_debugport(sc); 450 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 451 } 452 #endif 453 454 #ifdef __GENERIC_SOFT_INTERRUPTS 455 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, comsoft, sc); 456 #endif 457 } 458 459 int 460 comopen(dev, flag, mode, p) 461 dev_t dev; 462 int flag, mode; 463 struct proc *p; 464 { 465 int unit = COMUNIT(dev); 466 struct com_softc *sc; 467 struct tty *tp; 468 int s, s2; 469 int error = 0; 470 471 if (unit >= com_cd.cd_ndevs) 472 return (ENXIO); 473 sc = com_cd.cd_devs[unit]; 474 if (!sc) 475 return (ENXIO); 476 477 #ifdef KGDB 478 /* 479 * If this is the kgdb port, no other use is permitted. 480 */ 481 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 482 return (EBUSY); 483 #endif 484 485 if (!sc->sc_tty) { 486 tp = sc->sc_tty = ttymalloc(); 487 tty_attach(tp); 488 } else 489 tp = sc->sc_tty; 490 491 if (ISSET(tp->t_state, TS_ISOPEN) && 492 ISSET(tp->t_state, TS_XCLUDE) && 493 p->p_ucred->cr_uid != 0) 494 return (EBUSY); 495 496 s = spltty(); 497 498 /* We need to set this early for the benefit of comsoft(). */ 499 SET(tp->t_state, TS_WOPEN); 500 501 /* 502 * Do the following iff this is a first open. 503 */ 504 if (!ISSET(tp->t_state, TS_ISOPEN)) { 505 struct termios t; 506 507 /* Turn on interrupts. */ 508 sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC; 509 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 510 511 /* Fetch the current modem control status, needed later. */ 512 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); 513 514 /* Add some entry points needed by the tty layer. */ 515 tp->t_oproc = comstart; 516 tp->t_param = comparam; 517 tp->t_hwiflow = comhwiflow; 518 tp->t_dev = dev; 519 520 /* 521 * Initialize the termios status to the defaults. Add in the 522 * sticky bits from TIOCSFLAGS. 523 */ 524 t.c_ispeed = 0; 525 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 526 t.c_ospeed = comconsrate; 527 t.c_cflag = comconscflag; 528 } else { 529 t.c_ospeed = TTYDEF_SPEED; 530 t.c_cflag = TTYDEF_CFLAG; 531 } 532 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 533 SET(t.c_cflag, CLOCAL); 534 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 535 SET(t.c_cflag, CRTSCTS); 536 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 537 SET(t.c_cflag, MDMBUF); 538 tp->t_iflag = TTYDEF_IFLAG; 539 tp->t_oflag = TTYDEF_OFLAG; 540 tp->t_lflag = TTYDEF_LFLAG; 541 ttychars(tp); 542 (void) comparam(tp, &t); 543 ttsetwater(tp); 544 545 s2 = splserial(); 546 547 /* 548 * Turn on DTR. We must always do this, even if carrier is not 549 * present, because otherwise we'd have to use TIOCSDTR 550 * immediately after setting CLOCAL. We will drop DTR only on 551 * the next high-low transition of DCD, or by explicit request. 552 */ 553 com_modem(sc, 1); 554 555 /* Clear the input ring, and unblock. */ 556 sc->sc_rbput = sc->sc_rbget = 0; 557 sc->sc_rbavail = RXBUFSIZE; 558 com_iflush(sc); 559 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 560 com_hwiflow(sc); 561 562 #ifdef COM_DEBUG 563 if (com_debug) 564 comstatus(sc, "comopen "); 565 #endif 566 567 splx(s2); 568 } 569 error = 0; 570 571 /* If we're doing a blocking open... */ 572 if (!ISSET(flag, O_NONBLOCK)) 573 /* ...then wait for carrier. */ 574 while (!ISSET(tp->t_state, TS_CARR_ON) && 575 !ISSET(tp->t_cflag, CLOCAL | MDMBUF)) { 576 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 577 ttopen, 0); 578 if (error) { 579 /* 580 * If the open was interrupted and nobody 581 * else has the device open, then hang up. 582 */ 583 if (!ISSET(tp->t_state, TS_ISOPEN)) { 584 com_modem(sc, 0); 585 CLR(tp->t_state, TS_WOPEN); 586 ttwakeup(tp); 587 } 588 break; 589 } 590 SET(tp->t_state, TS_WOPEN); 591 } 592 593 splx(s); 594 if (error == 0) 595 error = (*linesw[tp->t_line].l_open)(dev, tp); 596 return (error); 597 } 598 599 int 600 comclose(dev, flag, mode, p) 601 dev_t dev; 602 int flag, mode; 603 struct proc *p; 604 { 605 int unit = COMUNIT(dev); 606 struct com_softc *sc = com_cd.cd_devs[unit]; 607 struct tty *tp = sc->sc_tty; 608 int s; 609 610 /* XXX This is for cons.c. */ 611 if (!ISSET(tp->t_state, TS_ISOPEN)) 612 return (0); 613 614 (*linesw[tp->t_line].l_close)(tp, flag); 615 ttyclose(tp); 616 617 /* If we were asserting flow control, then deassert it. */ 618 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 619 com_hwiflow(sc); 620 /* Clear any break condition set with TIOCSBRK. */ 621 com_break(sc, 0); 622 /* 623 * Hang up if necessary. Wait a bit, so the other side has time to 624 * notice even if we immediately open the port again. 625 */ 626 if (ISSET(tp->t_cflag, HUPCL)) { 627 com_modem(sc, 0); 628 (void) tsleep(sc, TTIPRI, ttclos, hz); 629 } 630 631 s = splserial(); 632 /* Turn off interrupts. */ 633 #ifdef DDB 634 if(ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 635 sc->sc_ier = IER_ERXRDY; /* interrupt on break */ 636 else 637 #else 638 sc->sc_ier = 0; 639 #endif 640 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 641 splx(s); 642 643 return (0); 644 } 645 646 int 647 comread(dev, uio, flag) 648 dev_t dev; 649 struct uio *uio; 650 int flag; 651 { 652 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 653 struct tty *tp = sc->sc_tty; 654 655 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 656 } 657 658 int 659 comwrite(dev, uio, flag) 660 dev_t dev; 661 struct uio *uio; 662 int flag; 663 { 664 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 665 struct tty *tp = sc->sc_tty; 666 667 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 668 } 669 670 struct tty * 671 comtty(dev) 672 dev_t dev; 673 { 674 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 675 struct tty *tp = sc->sc_tty; 676 677 return (tp); 678 } 679 680 static u_char 681 tiocm_xxx2mcr(data) 682 int data; 683 { 684 u_char m = 0; 685 686 if (ISSET(data, TIOCM_DTR)) 687 SET(m, MCR_DTR); 688 if (ISSET(data, TIOCM_RTS)) 689 SET(m, MCR_RTS); 690 return m; 691 } 692 693 int 694 comioctl(dev, cmd, data, flag, p) 695 dev_t dev; 696 u_long cmd; 697 caddr_t data; 698 int flag; 699 struct proc *p; 700 { 701 int unit = COMUNIT(dev); 702 struct com_softc *sc = com_cd.cd_devs[unit]; 703 struct tty *tp = sc->sc_tty; 704 int error; 705 706 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 707 if (error >= 0) 708 return (error); 709 710 error = ttioctl(tp, cmd, data, flag, p); 711 if (error >= 0) 712 return (error); 713 714 switch (cmd) { 715 case TIOCSBRK: 716 com_break(sc, 1); 717 break; 718 719 case TIOCCBRK: 720 com_break(sc, 0); 721 break; 722 723 case TIOCSDTR: 724 com_modem(sc, 1); 725 break; 726 727 case TIOCCDTR: 728 com_modem(sc, 0); 729 break; 730 731 case TIOCGFLAGS: 732 *(int *)data = sc->sc_swflags; 733 break; 734 735 case TIOCSFLAGS: 736 error = suser(p->p_ucred, &p->p_acflag); 737 if (error) 738 return (error); 739 sc->sc_swflags = *(int *)data; 740 break; 741 742 case TIOCMSET: 743 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 744 /*FALLTHROUGH*/ 745 746 case TIOCMBIS: 747 SET(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 748 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 749 break; 750 751 case TIOCMBIC: 752 CLR(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 753 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 754 break; 755 756 case TIOCMGET: { 757 u_char m; 758 int bits = 0; 759 760 m = sc->sc_mcr; 761 if (ISSET(m, MCR_DTR)) 762 SET(bits, TIOCM_DTR); 763 if (ISSET(m, MCR_RTS)) 764 SET(bits, TIOCM_RTS); 765 m = sc->sc_msr; 766 if (ISSET(m, MSR_DCD)) 767 SET(bits, TIOCM_CD); 768 if (ISSET(m, MSR_CTS)) 769 SET(bits, TIOCM_CTS); 770 if (ISSET(m, MSR_DSR)) 771 SET(bits, TIOCM_DSR); 772 if (ISSET(m, MSR_RI | MSR_TERI)) 773 SET(bits, TIOCM_RI); 774 if (bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_ier)) 775 SET(bits, TIOCM_LE); 776 *(int *)data = bits; 777 break; 778 } 779 default: 780 return (ENOTTY); 781 } 782 783 #ifdef COM_DEBUG 784 if (com_debug) 785 comstatus(sc, "comioctl "); 786 #endif 787 788 return (0); 789 } 790 791 integrate void 792 com_schedrx(sc) 793 struct com_softc *sc; 794 { 795 796 sc->sc_rx_ready = 1; 797 798 /* Wake up the poller. */ 799 #ifdef __GENERIC_SOFT_INTERRUPTS 800 softintr_schedule(sc->sc_si); 801 #else 802 #ifndef alpha 803 setsoftserial(); 804 #else 805 if (!com_softintr_scheduled) { 806 com_softintr_scheduled = 1; 807 timeout(comsoft, NULL, 1); 808 } 809 #endif 810 #endif 811 } 812 813 void 814 com_break(sc, onoff) 815 struct com_softc *sc; 816 int onoff; 817 { 818 int s; 819 820 s = splserial(); 821 if (onoff) 822 SET(sc->sc_lcr, LCR_SBREAK); 823 else 824 CLR(sc->sc_lcr, LCR_SBREAK); 825 826 if (!sc->sc_heldchange) { 827 if (sc->sc_tx_busy) { 828 sc->sc_heldtbc = sc->sc_tbc; 829 sc->sc_tbc = 0; 830 sc->sc_heldchange = 1; 831 } else 832 com_loadchannelregs(sc); 833 } 834 splx(s); 835 } 836 837 void 838 com_modem(sc, onoff) 839 struct com_softc *sc; 840 int onoff; 841 { 842 int s; 843 844 s = splserial(); 845 if (onoff) 846 SET(sc->sc_mcr, sc->sc_mcr_dtr); 847 else 848 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 849 850 if (!sc->sc_heldchange) { 851 if (sc->sc_tx_busy) { 852 sc->sc_heldtbc = sc->sc_tbc; 853 sc->sc_tbc = 0; 854 sc->sc_heldchange = 1; 855 } else 856 com_loadchannelregs(sc); 857 } 858 splx(s); 859 } 860 861 static u_char 862 cflag2lcr(cflag) 863 tcflag_t cflag; 864 { 865 u_char lcr = 0; 866 867 switch (ISSET(cflag, CSIZE)) { 868 case CS5: 869 SET(lcr, LCR_5BITS); 870 break; 871 case CS6: 872 SET(lcr, LCR_6BITS); 873 break; 874 case CS7: 875 SET(lcr, LCR_7BITS); 876 break; 877 case CS8: 878 SET(lcr, LCR_8BITS); 879 break; 880 } 881 if (ISSET(cflag, PARENB)) { 882 SET(lcr, LCR_PENAB); 883 if (!ISSET(cflag, PARODD)) 884 SET(lcr, LCR_PEVEN); 885 } 886 if (ISSET(cflag, CSTOPB)) 887 SET(lcr, LCR_STOPB); 888 889 return (lcr); 890 } 891 892 int 893 comparam(tp, t) 894 struct tty *tp; 895 struct termios *t; 896 { 897 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 898 int ospeed = comspeed(t->c_ospeed, sc->sc_frequency); 899 u_char lcr; 900 int s; 901 902 /* check requested parameters */ 903 if (ospeed < 0) 904 return (EINVAL); 905 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 906 return (EINVAL); 907 908 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 909 910 s = splserial(); 911 912 sc->sc_lcr = lcr; 913 914 /* 915 * For the console, always force CLOCAL and !HUPCL, so that the port 916 * is always active. 917 */ 918 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 919 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 920 SET(t->c_cflag, CLOCAL); 921 CLR(t->c_cflag, HUPCL); 922 } 923 924 /* 925 * If we're not in a mode that assumes a connection is present, then 926 * ignore carrier changes. 927 */ 928 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 929 sc->sc_msr_dcd = 0; 930 else 931 sc->sc_msr_dcd = MSR_DCD; 932 /* 933 * Set the flow control pins depending on the current flow control 934 * mode. 935 */ 936 if (ISSET(t->c_cflag, CRTSCTS)) { 937 sc->sc_mcr_dtr = MCR_DTR; 938 sc->sc_mcr_rts = MCR_RTS; 939 sc->sc_msr_cts = MSR_CTS; 940 sc->sc_r_hiwat = RXHIWAT; 941 sc->sc_r_lowat = RXLOWAT; 942 } else if (ISSET(t->c_cflag, MDMBUF)) { 943 /* 944 * For DTR/DCD flow control, make sure we don't toggle DTR for 945 * carrier detection. 946 */ 947 sc->sc_mcr_dtr = 0; 948 sc->sc_mcr_rts = MCR_DTR; 949 sc->sc_msr_cts = MSR_DCD; 950 sc->sc_r_hiwat = RXHIWAT; 951 sc->sc_r_lowat = RXLOWAT; 952 } else { 953 /* 954 * If no flow control, then always set RTS. This will make 955 * the other side happy if it mistakenly thinks we're doing 956 * RTS/CTS flow control. 957 */ 958 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 959 sc->sc_mcr_rts = 0; 960 sc->sc_msr_cts = 0; 961 sc->sc_r_hiwat = 0; 962 sc->sc_r_lowat = 0; 963 if (ISSET(sc->sc_mcr, MCR_DTR)) 964 SET(sc->sc_mcr, MCR_RTS); 965 else 966 CLR(sc->sc_mcr, MCR_RTS); 967 } 968 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 969 970 #if 0 971 if (ospeed == 0) 972 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 973 else 974 SET(sc->sc_mcr, sc->sc_mcr_dtr); 975 #endif 976 977 sc->sc_dlbl = ospeed; 978 sc->sc_dlbh = ospeed >> 8; 979 980 /* 981 * Set the FIFO threshold based on the receive speed. 982 * 983 * * If it's a low speed, it's probably a mouse or some other 984 * interactive device, so set the threshold low. 985 * * If it's a high speed, trim the trigger level down to prevent 986 * overflows. 987 * * Otherwise set it a bit higher. 988 */ 989 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) 990 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 991 else if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) 992 sc->sc_fifo = FIFO_ENABLE | 993 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 994 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 995 else 996 sc->sc_fifo = 0; 997 998 /* and copy to tty */ 999 tp->t_ispeed = 0; 1000 tp->t_ospeed = t->c_ospeed; 1001 tp->t_cflag = t->c_cflag; 1002 1003 if (!sc->sc_heldchange) { 1004 if (sc->sc_tx_busy) { 1005 sc->sc_heldtbc = sc->sc_tbc; 1006 sc->sc_tbc = 0; 1007 sc->sc_heldchange = 1; 1008 } else 1009 com_loadchannelregs(sc); 1010 } 1011 1012 splx(s); 1013 1014 /* 1015 * Update the tty layer's idea of the carrier bit, in case we changed 1016 * CLOCAL or MDMBUF. We don't hang up here; we only do that if we 1017 * lose carrier while carrier detection is on. 1018 */ 1019 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1020 1021 #ifdef COM_DEBUG 1022 if (com_debug) 1023 comstatus(sc, "comparam "); 1024 #endif 1025 1026 /* Block or unblock as needed. */ 1027 if (!ISSET(t->c_cflag, CHWFLOW)) { 1028 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1029 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1030 com_schedrx(sc); 1031 } 1032 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1033 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1034 com_hwiflow(sc); 1035 } 1036 if (sc->sc_tx_stopped) { 1037 sc->sc_tx_stopped = 0; 1038 comstart(tp); 1039 } 1040 } else { 1041 /* XXXXX FIX ME */ 1042 #if 0 1043 commsrint(sc, tp); 1044 #endif 1045 } 1046 1047 return (0); 1048 } 1049 1050 void 1051 com_iflush(sc) 1052 struct com_softc *sc; 1053 { 1054 bus_space_tag_t iot = sc->sc_iot; 1055 bus_space_handle_t ioh = sc->sc_ioh; 1056 1057 /* flush any pending I/O */ 1058 while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) 1059 (void) bus_space_read_1(iot, ioh, com_data); 1060 } 1061 1062 void 1063 com_loadchannelregs(sc) 1064 struct com_softc *sc; 1065 { 1066 bus_space_tag_t iot = sc->sc_iot; 1067 bus_space_handle_t ioh = sc->sc_ioh; 1068 1069 /* XXXXX necessary? */ 1070 com_iflush(sc); 1071 1072 bus_space_write_1(iot, ioh, com_ier, 0); 1073 1074 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr | LCR_DLAB); 1075 bus_space_write_1(iot, ioh, com_dlbl, sc->sc_dlbl); 1076 bus_space_write_1(iot, ioh, com_dlbh, sc->sc_dlbh); 1077 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr); 1078 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active = sc->sc_mcr); 1079 bus_space_write_1(iot, ioh, com_fifo, sc->sc_fifo); 1080 1081 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1082 } 1083 1084 int 1085 comhwiflow(tp, block) 1086 struct tty *tp; 1087 int block; 1088 { 1089 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1090 int s; 1091 1092 if (sc->sc_mcr_rts == 0) 1093 return (0); 1094 1095 s = splserial(); 1096 if (block) { 1097 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1098 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1099 com_hwiflow(sc); 1100 } 1101 } else { 1102 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1103 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1104 com_schedrx(sc); 1105 } 1106 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1107 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1108 com_hwiflow(sc); 1109 } 1110 } 1111 splx(s); 1112 return (1); 1113 } 1114 1115 /* 1116 * (un)block input via hw flowcontrol 1117 */ 1118 void 1119 com_hwiflow(sc) 1120 struct com_softc *sc; 1121 { 1122 bus_space_tag_t iot = sc->sc_iot; 1123 bus_space_handle_t ioh = sc->sc_ioh; 1124 1125 if (sc->sc_mcr_rts == 0) 1126 return; 1127 1128 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1129 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1130 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1131 } else { 1132 SET(sc->sc_mcr, sc->sc_mcr_rts); 1133 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1134 } 1135 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active); 1136 } 1137 1138 1139 void 1140 comstart(tp) 1141 struct tty *tp; 1142 { 1143 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1144 bus_space_tag_t iot = sc->sc_iot; 1145 bus_space_handle_t ioh = sc->sc_ioh; 1146 int s; 1147 1148 s = spltty(); 1149 if (ISSET(tp->t_state, TS_BUSY)) 1150 goto out; 1151 if (ISSET(tp->t_state, TS_TIMEOUT | TS_TTSTOP)) 1152 goto stopped; 1153 1154 if (sc->sc_tx_stopped) 1155 goto stopped; 1156 1157 if (tp->t_outq.c_cc <= tp->t_lowat) { 1158 if (ISSET(tp->t_state, TS_ASLEEP)) { 1159 CLR(tp->t_state, TS_ASLEEP); 1160 wakeup(&tp->t_outq); 1161 } 1162 selwakeup(&tp->t_wsel); 1163 if (tp->t_outq.c_cc == 0) 1164 goto stopped; 1165 } 1166 1167 /* Grab the first contiguous region of buffer space. */ 1168 { 1169 u_char *tba; 1170 int tbc; 1171 1172 tba = tp->t_outq.c_cf; 1173 tbc = ndqb(&tp->t_outq, 0); 1174 1175 (void)splserial(); 1176 1177 sc->sc_tba = tba; 1178 sc->sc_tbc = tbc; 1179 } 1180 1181 SET(tp->t_state, TS_BUSY); 1182 sc->sc_tx_busy = 1; 1183 1184 /* Enable transmit completion interrupts if necessary. */ 1185 if (!ISSET(sc->sc_ier, IER_ETXRDY)) { 1186 SET(sc->sc_ier, IER_ETXRDY); 1187 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1188 } 1189 1190 /* Output the first chunk of the contiguous buffer. */ 1191 { 1192 int n; 1193 1194 n = sc->sc_fifolen; 1195 if (n > sc->sc_tbc) 1196 n = sc->sc_tbc; 1197 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1198 sc->sc_tbc -= n; 1199 sc->sc_tba += n; 1200 } 1201 splx(s); 1202 return; 1203 1204 stopped: 1205 /* Disable transmit completion interrupts if necessary. */ 1206 if (ISSET(sc->sc_ier, IER_ETXRDY)) { 1207 CLR(sc->sc_ier, IER_ETXRDY); 1208 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1209 } 1210 out: 1211 splx(s); 1212 return; 1213 } 1214 1215 /* 1216 * Stop output on a line. 1217 */ 1218 void 1219 comstop(tp, flag) 1220 struct tty *tp; 1221 int flag; 1222 { 1223 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1224 int s; 1225 1226 s = splserial(); 1227 if (ISSET(tp->t_state, TS_BUSY)) { 1228 /* Stop transmitting at the next chunk. */ 1229 sc->sc_tbc = 0; 1230 sc->sc_heldtbc = 0; 1231 if (!ISSET(tp->t_state, TS_TTSTOP)) 1232 SET(tp->t_state, TS_FLUSH); 1233 } 1234 splx(s); 1235 } 1236 1237 void 1238 comdiag(arg) 1239 void *arg; 1240 { 1241 struct com_softc *sc = arg; 1242 int overflows, floods; 1243 int s; 1244 1245 s = splserial(); 1246 overflows = sc->sc_overflows; 1247 sc->sc_overflows = 0; 1248 floods = sc->sc_floods; 1249 sc->sc_floods = 0; 1250 sc->sc_errors = 0; 1251 splx(s); 1252 1253 log(LOG_WARNING, 1254 "%s: %d silo overflow%s, %d ibuf flood%s\n", 1255 sc->sc_dev.dv_xname, 1256 overflows, overflows == 1 ? "" : "s", 1257 floods, floods == 1 ? "" : "s"); 1258 } 1259 1260 integrate void 1261 comrxint(sc, tp) 1262 struct com_softc *sc; 1263 struct tty *tp; 1264 { 1265 u_int get, cc, scc; 1266 int code; 1267 u_char lsr; 1268 int s; 1269 static int lsrmap[8] = { 1270 0, TTY_PE, 1271 TTY_FE, TTY_PE|TTY_FE, 1272 TTY_FE, TTY_PE|TTY_FE, 1273 TTY_FE, TTY_PE|TTY_FE 1274 }; 1275 1276 get = sc->sc_rbget; 1277 scc = cc = RXBUFSIZE - sc->sc_rbavail; 1278 1279 if (cc == RXBUFSIZE) { 1280 sc->sc_floods++; 1281 if (sc->sc_errors++ == 0) 1282 timeout(comdiag, sc, 60 * hz); 1283 } 1284 1285 while (cc) { 1286 lsr = sc->sc_lbuf[get]; 1287 if (ISSET(lsr, LSR_OE)) { 1288 sc->sc_overflows++; 1289 if (sc->sc_errors++ == 0) 1290 timeout(comdiag, sc, 60 * hz); 1291 } 1292 code = sc->sc_rbuf[get] | 1293 lsrmap[(lsr & (LSR_BI|LSR_FE|LSR_PE)) >> 2]; 1294 if ((*linesw[tp->t_line].l_rint)(code, tp) == -1) { 1295 /* 1296 * The line discipline's buffer is out of space. 1297 */ 1298 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1299 /* 1300 * We're either not using flow control, or the 1301 * line discipline didn't tell us to block for 1302 * some reason. Either way, we have no way to 1303 * know when there's more space available, so 1304 * just drop the rest of the data. 1305 */ 1306 get = (get + cc) & RXBUFMASK; 1307 cc = 0; 1308 } else { 1309 /* 1310 * Don't schedule any more receive processing 1311 * until the line discipline tells us there's 1312 * space available (through comhwiflow()). 1313 * Leave the rest of the data in the input 1314 * buffer. 1315 */ 1316 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1317 } 1318 break; 1319 } 1320 get = (get + 1) & RXBUFMASK; 1321 cc--; 1322 } 1323 1324 if (cc != scc) { 1325 sc->sc_rbget = get; 1326 s = splserial(); 1327 cc = sc->sc_rbavail += scc - cc; 1328 /* Buffers should be ok again, release possible block. */ 1329 if (cc >= sc->sc_r_lowat) { 1330 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1331 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1332 SET(sc->sc_ier, IER_ERXRDY); 1333 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 1334 } 1335 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1336 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1337 com_hwiflow(sc); 1338 } 1339 } 1340 splx(s); 1341 } 1342 } 1343 1344 integrate void 1345 comtxint(sc, tp) 1346 struct com_softc *sc; 1347 struct tty *tp; 1348 { 1349 1350 CLR(tp->t_state, TS_BUSY); 1351 if (ISSET(tp->t_state, TS_FLUSH)) 1352 CLR(tp->t_state, TS_FLUSH); 1353 else 1354 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1355 (*linesw[tp->t_line].l_start)(tp); 1356 } 1357 1358 integrate void 1359 commsrint(sc, tp) 1360 struct com_softc *sc; 1361 struct tty *tp; 1362 { 1363 u_char msr, delta; 1364 int s; 1365 1366 s = splserial(); 1367 msr = sc->sc_msr; 1368 delta = sc->sc_msr_delta; 1369 sc->sc_msr_delta = 0; 1370 splx(s); 1371 1372 if (ISSET(delta, sc->sc_msr_dcd)) { 1373 /* 1374 * Inform the tty layer that carrier detect changed. 1375 */ 1376 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD)); 1377 } 1378 1379 if (ISSET(delta, sc->sc_msr_cts)) { 1380 /* Block or unblock output according to flow control. */ 1381 if (ISSET(msr, sc->sc_msr_cts)) { 1382 sc->sc_tx_stopped = 0; 1383 (*linesw[tp->t_line].l_start)(tp); 1384 } else { 1385 sc->sc_tx_stopped = 1; 1386 } 1387 } 1388 1389 #ifdef COM_DEBUG 1390 if (com_debug) 1391 comstatus(sc, "commsrint"); 1392 #endif 1393 } 1394 1395 #ifdef __GENERIC_SOFT_INTERRUPTS 1396 void 1397 comsoft(arg) 1398 void *arg; 1399 { 1400 struct com_softc *sc = arg; 1401 struct tty *tp; 1402 1403 { 1404 #else 1405 void 1406 #ifndef alpha 1407 comsoft() 1408 #else 1409 comsoft(arg) 1410 void *arg; 1411 #endif 1412 { 1413 struct com_softc *sc; 1414 struct tty *tp; 1415 int unit; 1416 #ifdef alpha 1417 int s; 1418 1419 s = splsoftserial(); 1420 com_softintr_scheduled = 0; 1421 #endif 1422 1423 for (unit = 0; unit < com_cd.cd_ndevs; unit++) { 1424 sc = com_cd.cd_devs[unit]; 1425 if (sc == NULL) 1426 continue; 1427 1428 tp = sc->sc_tty; 1429 if (tp == NULL || !ISSET(tp->t_state, TS_ISOPEN | TS_WOPEN)) 1430 continue; 1431 #endif 1432 tp = sc->sc_tty; 1433 1434 if (sc->sc_rx_ready) { 1435 sc->sc_rx_ready = 0; 1436 comrxint(sc, tp); 1437 } 1438 1439 if (sc->sc_st_check) { 1440 sc->sc_st_check = 0; 1441 commsrint(sc, tp); 1442 } 1443 1444 if (sc->sc_tx_done) { 1445 sc->sc_tx_done = 0; 1446 comtxint(sc, tp); 1447 } 1448 } 1449 1450 #ifndef __GENERIC_SOFT_INTERRUPTS 1451 #ifdef alpha 1452 splx(s); 1453 #endif 1454 #endif 1455 } 1456 1457 int 1458 comintr(arg) 1459 void *arg; 1460 { 1461 struct com_softc *sc = arg; 1462 bus_space_tag_t iot = sc->sc_iot; 1463 bus_space_handle_t ioh = sc->sc_ioh; 1464 u_char lsr, iir; 1465 u_int put, cc; 1466 1467 iir = bus_space_read_1(iot, ioh, com_iir); 1468 if (ISSET(iir, IIR_NOPEND)) 1469 return (0); 1470 1471 put = sc->sc_rbput; 1472 cc = sc->sc_rbavail; 1473 1474 do { 1475 u_char msr, delta; 1476 1477 lsr = bus_space_read_1(iot, ioh, com_lsr); 1478 #if defined(DDB) || defined(KGDB) 1479 if (ISSET(lsr, LSR_BI)) { 1480 #ifdef DDB 1481 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1482 Debugger(); 1483 continue; 1484 } 1485 #endif 1486 #ifdef KGDB 1487 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) { 1488 kgdb_connect(1); 1489 continue; 1490 } 1491 #endif 1492 } 1493 #endif /* DDB || KGDB */ 1494 1495 if (ISSET(lsr, LSR_RCV_MASK) && 1496 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1497 for (; ISSET(lsr, LSR_RCV_MASK) && cc > 0; cc--) { 1498 sc->sc_rbuf[put] = 1499 bus_space_read_1(iot, ioh, com_data); 1500 sc->sc_lbuf[put] = lsr; 1501 put = (put + 1) & RXBUFMASK; 1502 lsr = bus_space_read_1(iot, ioh, com_lsr); 1503 } 1504 /* 1505 * Current string of incoming characters ended because 1506 * no more data was available. Schedule a receive event 1507 * if any data was received. Drop any characters that 1508 * we couldn't handle. 1509 */ 1510 sc->sc_rbput = put; 1511 sc->sc_rbavail = cc; 1512 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1513 sc->sc_rx_ready = 1; 1514 /* 1515 * See if we are in danger of overflowing a buffer. If 1516 * so, use hardware flow control to ease the pressure. 1517 */ 1518 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1519 cc < sc->sc_r_hiwat) { 1520 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1521 com_hwiflow(sc); 1522 } 1523 /* 1524 * If we're out of space, disable receive interrupts 1525 * until the queue has drained a bit. 1526 */ 1527 if (!cc) { 1528 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1529 CLR(sc->sc_ier, IER_ERXRDY); 1530 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1531 } 1532 } else { 1533 if ((iir & IIR_IMASK) == IIR_RXRDY) { 1534 bus_space_write_1(iot, ioh, com_ier, 0); 1535 delay(10); 1536 bus_space_write_1(iot, ioh, com_ier,sc->sc_ier); 1537 iir = IIR_NOPEND; 1538 continue; 1539 } 1540 } 1541 1542 msr = bus_space_read_1(iot, ioh, com_msr); 1543 delta = msr ^ sc->sc_msr; 1544 sc->sc_msr = msr; 1545 if (ISSET(delta, sc->sc_msr_mask)) { 1546 sc->sc_msr_delta |= delta; 1547 1548 /* 1549 * Stop output immediately if we lose the output 1550 * flow control signal or carrier detect. 1551 */ 1552 if (ISSET(~msr, sc->sc_msr_mask)) { 1553 sc->sc_tbc = 0; 1554 sc->sc_heldtbc = 0; 1555 #ifdef COM_DEBUG 1556 if (com_debug) 1557 comstatus(sc, "comintr "); 1558 #endif 1559 } 1560 1561 sc->sc_st_check = 1; 1562 } 1563 } while (!ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_NOPEND)); 1564 1565 /* 1566 * Done handling any receive interrupts. See if data can be 1567 * transmitted as well. Schedule tx done event if no data left 1568 * and tty was marked busy. 1569 */ 1570 if (ISSET(lsr, LSR_TXRDY)) { 1571 /* 1572 * If we've delayed a parameter change, do it now, and restart 1573 * output. 1574 */ 1575 if (sc->sc_heldchange) { 1576 com_loadchannelregs(sc); 1577 sc->sc_heldchange = 0; 1578 sc->sc_tbc = sc->sc_heldtbc; 1579 sc->sc_heldtbc = 0; 1580 } 1581 /* Output the next chunk of the contiguous buffer, if any. */ 1582 if (sc->sc_tbc > 0) { 1583 int n; 1584 1585 n = sc->sc_fifolen; 1586 if (n > sc->sc_tbc) 1587 n = sc->sc_tbc; 1588 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1589 sc->sc_tbc -= n; 1590 sc->sc_tba += n; 1591 } else if (sc->sc_tx_busy) { 1592 sc->sc_tx_busy = 0; 1593 sc->sc_tx_done = 1; 1594 } 1595 } 1596 1597 /* Wake up the poller. */ 1598 #ifdef __GENERIC_SOFT_INTERRUPTS 1599 softintr_schedule(sc->sc_si); 1600 #else 1601 #ifndef alpha 1602 setsoftserial(); 1603 #else 1604 if (!com_softintr_scheduled) { 1605 com_softintr_scheduled = 1; 1606 timeout(comsoft, NULL, 1); 1607 } 1608 #endif 1609 #endif 1610 return (1); 1611 } 1612 1613 /* 1614 * The following functions are polled getc and putc routines, shared 1615 * by the console and kgdb glue. 1616 */ 1617 1618 int 1619 com_common_getc(iot, ioh) 1620 bus_space_tag_t iot; 1621 bus_space_handle_t ioh; 1622 { 1623 int s = splserial(); 1624 u_char stat, c; 1625 1626 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) 1627 ; 1628 c = bus_space_read_1(iot, ioh, com_data); 1629 stat = bus_space_read_1(iot, ioh, com_iir); 1630 splx(s); 1631 return (c); 1632 } 1633 1634 void 1635 com_common_putc(iot, ioh, c) 1636 bus_space_tag_t iot; 1637 bus_space_handle_t ioh; 1638 int c; 1639 { 1640 int s = splserial(); 1641 u_char stat; 1642 register int timo; 1643 1644 /* wait for any pending transmission to finish */ 1645 timo = 50000; 1646 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 1647 && --timo) 1648 ; 1649 bus_space_write_1(iot, ioh, com_data, c); 1650 /* wait for this transmission to complete */ 1651 timo = 1500000; 1652 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 1653 && --timo) 1654 ; 1655 /* clear any interrupts generated by this transmission */ 1656 stat = bus_space_read_1(iot, ioh, com_iir); 1657 splx(s); 1658 } 1659 1660 /* 1661 * Initialize UART to known state. 1662 */ 1663 int 1664 cominit(iot, iobase, rate, frequency, cflag, iohp) 1665 bus_space_tag_t iot; 1666 int iobase; 1667 int rate, frequency; 1668 tcflag_t cflag; 1669 bus_space_handle_t *iohp; 1670 { 1671 bus_space_handle_t ioh; 1672 1673 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) 1674 return (ENOMEM); /* ??? */ 1675 1676 bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); 1677 rate = comspeed(rate, frequency); 1678 bus_space_write_1(iot, ioh, com_dlbl, rate); 1679 bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); 1680 bus_space_write_1(iot, ioh, com_lcr, cflag2lcr(cflag)); 1681 bus_space_write_1(iot, ioh, com_mcr, 0); 1682 bus_space_write_1(iot, ioh, com_fifo, 1683 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1); 1684 bus_space_write_1(iot, ioh, com_ier, 0); 1685 1686 *iohp = ioh; 1687 return (0); 1688 } 1689 1690 /* 1691 * Following are all routines needed for COM to act as console 1692 */ 1693 1694 int 1695 comcnattach(iot, iobase, rate, frequency, cflag) 1696 bus_space_tag_t iot; 1697 int iobase; 1698 int rate, frequency; 1699 tcflag_t cflag; 1700 { 1701 int res; 1702 static struct consdev comcons = { NULL, NULL, 1703 comcngetc, comcnputc, comcnpollc, NODEV, CN_NORMAL}; 1704 1705 res = cominit(iot, iobase, rate, frequency, cflag, &comconsioh); 1706 if (res) 1707 return (res); 1708 1709 cn_tab = &comcons; 1710 1711 comconstag = iot; 1712 comconsaddr = iobase; 1713 comconsrate = rate; 1714 comconscflag = cflag; 1715 1716 return (0); 1717 } 1718 1719 int 1720 comcngetc(dev) 1721 dev_t dev; 1722 { 1723 1724 return (com_common_getc(comconstag, comconsioh)); 1725 } 1726 1727 /* 1728 * Console kernel output character routine. 1729 */ 1730 void 1731 comcnputc(dev, c) 1732 dev_t dev; 1733 int c; 1734 { 1735 1736 com_common_putc(comconstag, comconsioh, c); 1737 } 1738 1739 void 1740 comcnpollc(dev, on) 1741 dev_t dev; 1742 int on; 1743 { 1744 1745 } 1746 1747 #ifdef KGDB 1748 int 1749 com_kgdb_attach(iot, iobase, rate, frequency, cflag) 1750 bus_space_tag_t iot; 1751 int iobase; 1752 int rate, frequency; 1753 tcflag_t cflag; 1754 { 1755 int res; 1756 1757 if (iot == comconstag && iobase == comconsaddr) 1758 return (EBUSY); /* cannot share with console */ 1759 1760 res = cominit(iot, iobase, rate, frequency, cflag, &com_kgdb_ioh); 1761 if (res) 1762 return (res); 1763 1764 kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL); 1765 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 1766 1767 com_kgdb_iot = iot; 1768 com_kgdb_addr = iobase; 1769 1770 return (0); 1771 } 1772 1773 /* ARGSUSED */ 1774 int 1775 com_kgdb_getc(arg) 1776 void *arg; 1777 { 1778 1779 return (com_common_getc(com_kgdb_iot, com_kgdb_ioh)); 1780 } 1781 1782 /* ARGSUSED */ 1783 void 1784 com_kgdb_putc(arg, c) 1785 void *arg; 1786 int c; 1787 { 1788 1789 return (com_common_putc(com_kgdb_iot, com_kgdb_ioh, c)); 1790 } 1791 #endif /* KGDB */ 1792 1793 /* helper function to identify the com ports used by 1794 console or KGDB (and not yet autoconf attached) */ 1795 int 1796 com_is_console(iot, iobase, ioh) 1797 bus_space_tag_t iot; 1798 int iobase; 1799 bus_space_handle_t *ioh; 1800 { 1801 bus_space_handle_t help; 1802 1803 if (!comconsattached && 1804 iot == comconstag && iobase == comconsaddr) 1805 help = comconsioh; 1806 #ifdef KGDB 1807 else if (!com_kgdb_attached && 1808 iot == com_kgdb_iot && iobase == com_kgdb_addr) 1809 help = com_kgdb_ioh; 1810 #endif 1811 else 1812 return (0); 1813 1814 if (ioh) 1815 *ioh = help; 1816 return (1); 1817 } 1818
Indexes created Tue Sep 23 23:09:58 GMT 2025